diff --git a/src/DataTree.hh b/src/DataTree.hh
index 62da568185f0a0cfd1a7f10f32ea92473f502ac1..6e9f818dbba12ecb640869c8de4138279f6eeb8a 100644
--- a/src/DataTree.hh
+++ b/src/DataTree.hh
@@ -29,6 +29,7 @@ using namespace std;
 #include <iomanip>
 #include <cmath>
 #include <utility>
+#include <memory>
 
 #include "SymbolTable.hh"
 #include "NumericalConstants.hh"